Example sentence - He lived in the fourth house from the corner.
i wrote a sentence containing forth and fourth.
The word "be" is the fourth word in this sentence.
He came in fourth place.
There is not a fourth word.
cognate
Fourth means the number four in a series. Here are some sentences.He was fourth in line.The fourth float in the parade was the one our group made.I came in fourth in the race.
the punter on a foot ball team punted the ball on the fourth down.
I'm not your typical fourth-grader. That's just a typical horned toad.
Independence Day is on the fourth of July.
The kitten likes to nuzzle me.
The nouns in the sentence are teacher and class. The words "fourth grade class" can be considered a compound noun, or the compound word "fourth grade" can be considered a noun adjunct, where grade is also a noun.
I pulled your moms throttle into fourth gear.